M2M Control
by Infranet Technologies GmbH Ph: +49.40.69647-260
Tempowerkring 2 Fax: +49.40.69647-259
Germany Web: www.m2mcontrol.de
Technical Manual 1.05, C600 Professional
Page 11 of 24
Analog Inputs
The analog inputs are voltage inputs with a range from 0V to 10V DC. The analog voltage
is converted to a digital value with a resolution of 10bit or 1024 in decimal. The decimal
value with 10V applied to the input is 1023 and 512 for 5V.
The input signal is connected between AIN and AGND. AGND must be connected to the
reference of the connected equipment. Please be aware that deviations may occur, as the
system is very noise sensitive. Avoid long unshielded wires and large fast-changing
signals routed parallel to the analog signals.
The inputs are low-pass filtered, ESD- and transient protected.
X3: 16 pin (I/O) connector overview.
Pin Name Description
7 AIN 1 Analog input 1
8 AIN 2 Analog input 2
15 AGND Analog Ground
16 AGND Analog Ground
Serial port 1 / programming port / RS485 port.
This port can be used as general-purpose RS232 serial port or as a programming port. In
order to use the port for programming, the RS-DET pin must be connected to GND. When
using the port as general-purpose RS232, the RSDET pin must be left unconnected.
Further details on the programming cable are available in the M2M Control IDE online
help.
This serial port is shared with the RS485 communication port available on the 12 pin
connector. If the RS485 port is used it is not possible to use the RS232 port, and vice
versa. If however, a programming cable is inserted the RS485 communication is disabled
automatically.
The RS485 is a multi-drop network with a maximum of 32 units connected simultaneously
to the bus. The RS485 bus contains the A (positive) and B (negative) signals, as well as a
signal ground, which always must be connected to the common signal ground for all units
connected to the RS485 bus! The maximum cable length for the RS485 bus is approx 400
meters, however this limit can be influenced by the quality of the cable, signaling rate,
noise etc. At longer cable lengths, noisy environments or high communication speed it
might be necessary to terminate the transmission line with a 120 ohm resistor between
RS485A and RS485B at each end of the wires to avoid signal reflections etc.
Be aware that it is much confusion about the pin labeling of RS485. The above-mentioned
conditions for positive and negative signals are actually the inverse of the standard
released by EIA.
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